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A predictive framework for fermion masses and mixing is given by thesupersymmetric SO(10) model with one 10, one bar126, one 126 and one 210 Higgsrepresentations, and type II seesaw dominating the neutrino mass matrix. Weinvestigate the origin of the tension between this model and lepton mixing dataand refine previous numerical analyses. We discuss an extension of the minimalmodel that includes one 120 Higgs chiral superfield representation. Thisexhausts the possible renormalizable contributions to the Yukawa sector. Inspite of the increase in the number of parameters the predictivity of theminimal setting is not spoiled. We argue that the contributions to fermionmasses due to the doublet components of 120 can be naturally small compared tothose of 10 and 126, thus acting as a perturbation in the fermion massgeneration. The antisymmetric nature of the 120 Yukawa coupling affects atleading order the determination of the mixing angles and it allows to removethe inconsistencies between predictions and data on the neutrino parameters. Animprovement in the experimental bound on |Ue3| can tell this scenario from theminimal model.Comment: 11 pages, 3 figures; Note and references added on new KamLAND dat

Fermion masses in supersymmetric SO(10) with type II seesaw mechanism: A nonminimal predictive scenario